It was a range. ~8800-18000. Here is the text.
From 12 April 2009 to 10 April 2010, we estimate that approximately 60.8 million cases (range: 43.3-89.3 million), 274,304 hospitalizations (195,086-402,719), and 12,469 deaths (8868-18,306) occurred in the United States due to pH1N1.
https://pubmed.ncbi.nlm.nih.gov/21342903/